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Does the introduction explain the objective of the research presented in the preprint?

Yes

Yes, the objective is clearly stated in the final paragraph of the introduction. Their goal was twofold: 1) to define a unique unique genetic signature for the R3clone identification through targeted molecular diagnostics and 2) using this definition, screen isolates from neighbouring countries and public genomic databases to explore the geographic extent and cross-border transmission potential of the clone.

Are the methods well-suited for this research?

Somewhat appropriate

The researchers used the genomic methods appropriately. WGS and phylodynamic modeling are gold standard for tracking TB population dynamics. They also used multi-pronged identification to identify the clone, and validated the clone against WGS, which is also a strong approach. The flaws include: Sampling bias (especially convenience bias in Burundi). They also excluded low bacterial-load cases which may have undercounted their prevalence. In addition, the Burundi samples end in 2013, but Rwanda starts sampling in 2021. This 8 year gap makes it challenging to make any inferences about transmission (historical vs ongoing). They also used a self-described "loose" threshold of 12-SNP, and had to add rules after the analysis to track mutated clones.

Are the conclusions supported by the data?

Somewhat supported

The R3clone's population dynamics in Rwanada are well supported, and so is the specificity of the qPCR assay developed. It is also clear that this clone does exist beyond Rwanda. Although the authors acknowledge the limitation of their cross-border transmission claim, there is no epidemiological evidence (patient travel, timing, contacts) to support this. In addition, they claim that the existence of two R3clone subgroups in Burundi with different mutations suggests "bidirectional movement". We don't have temporal data (i.e. which country had cases first?) to establish this movement. Finally, their claim that "urgent regional coordination is needed" may not be accurate given we have no current data showing that the R3clone is actively spreading in sub-Saharan Africa.

Are the data presentations, including visualizations, well-suited to represent the data?

Somewhat appropriate and clear

Main figures (flowchart, Skyride plot) are clear and well-labeled with good use of color-coding and sizing. They are lacking geographic visualizations, temporal information, and the distribution of SRA isolates globally.

How clearly do the authors discuss, explain, and interpret their findings and potential next steps for the research?

Somewhat clearly

They clearly explain methods, and talk about their limitations. But, they are unclear about why coordinated regional action is needed now when the data is quite old. In addition, they don't provide concrete next steps other than "apply this framework to other strains". The discussion shows knowledge of epidemiological concepts, but there should be more clarity surrounding the transmission directionality claims and urgency of regional coordination.

Is the preprint likely to advance academic knowledge?

Somewhat likely

The qPCR tool and surveillence framework have real practical value, especially for lower resourced countries. The main policy conclusions about urgent regional transmission threats, however, are not supported. No real information is provided about how or when the R3clone is spreading, just that it does exist in places outside of Rwanda.

Would it benefit from language editing?

No

Strong language, no major grammatical issues noted.

Would you recommend this preprint to others?

Yes, but it needs to be improved

Is it ready for attention from an editor, publisher or broader audience?

Yes, after minor changes

Competing interests

The author declares that they have no competing interests.

Use of Artificial Intelligence (AI)

The author declares that they did not use generative AI to come up with new ideas for their review.